package cn.edu.henu.team.utils;

import android.content.Context;
import android.content.SharedPreferences;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;


/**
 *  SharedPreference 工具类
 *  Author: mrj
 */
public class SPUtils {
   /**
    * 保存在手机里面的文件名
    */
   public static final String FILE_NAME = "share_data";

   /**
    * 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法
    *
    * @param context
    * @param key
    * @param object
    */
   public static void put(Context context, String key, Object object) {

      SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
              Context.MODE_PRIVATE);
      SharedPreferences.Editor editor = sp.edit();

      if (object instanceof String) {
         editor.putString(key, (String) object);
      } else if (object instanceof Integer) {
         editor.putInt(key, (Integer) object);
      } else if (object instanceof Boolean) {
         editor.putBoolean(key, (Boolean) object);
      } else if (object instanceof Float) {
         editor.putFloat(key, (Float) object);
      } else if (object instanceof Long) {
         editor.putLong(key, (Long) object);
      } else {
         editor.putString(key, object.toString());
      }

      SharedPreferencesCompat.apply(editor);
   }

   /**
    * 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值
    *
    * @param context
    * @param key
    * @param defaultObject
    * @return
    */
   public static Object get(Context context, String key, Object defaultObject) {
      SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
              Context.MODE_PRIVATE);

      if (defaultObject instanceof String) {
         return sp.getString(key, (String) defaultObject);
      } else if (defaultObject instanceof Integer) {
         return sp.getInt(key, (Integer) defaultObject);
      } else if (defaultObject instanceof Boolean) {
         return sp.getBoolean(key, (Boolean) defaultObject);
      } else if (defaultObject instanceof Float) {
         return sp.getFloat(key, (Float) defaultObject);
      } else if (defaultObject instanceof Long) {
         return sp.getLong(key, (Long) defaultObject);
      }

      return null;
   }

   /**
    * 移除某个key值已经对应的值
    *
    * @param context
    * @param key
    */
   public static void remove(Context context, String key) {
      SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
              Context.MODE_PRIVATE);
      SharedPreferences.Editor editor = sp.edit();
      editor.remove(key);
      SharedPreferencesCompat.apply(editor);
   }

   /**
    * 清除所有数据
    *
    * @param context
    */
   public static void clear(Context context) {
      SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
              Context.MODE_PRIVATE);
      SharedPreferences.Editor editor = sp.edit();
      editor.clear();
      SharedPreferencesCompat.apply(editor);
   }

   /**
    * 查询某个key是否已经存在
    *
    * @param context
    * @param key
    * @return
    */
   public static boolean contains(Context context, String key) {
      SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
              Context.MODE_PRIVATE);
      return sp.contains(key);
   }

   /**
    * 返回所有的键值对
    *
    * @param context
    * @return
    */
   public static Map<String, ?> getAll(Context context) {
      SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
              Context.MODE_PRIVATE);
      return sp.getAll();
   }

   /**
    * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
    *
    * @author zhy
    */
   private static class SharedPreferencesCompat {
      private static final Method sApplyMethod = findApplyMethod();

      /**
       * 反射查找apply的方法
       *
       * @return
       */
      @SuppressWarnings({"unchecked", "rawtypes"})
      private static Method findApplyMethod() {
         try {
            Class clz = SharedPreferences.Editor.class;
            return clz.getMethod("apply");
         } catch (NoSuchMethodException e) {
         }

         return null;
      }

      /**
       * 如果找到则使用apply执行，否则使用commit
       *
       * @param editor
       */
      public static void apply(SharedPreferences.Editor editor) {
         try {
            if (sApplyMethod != null) {
               sApplyMethod.invoke(editor);
               return;
            }
         } catch (IllegalArgumentException e) {
         } catch (IllegalAccessException e) {
         } catch (InvocationTargetException e) {
         }
         editor.commit();
      }
   }

}
